Wilhelm

Yes, this mod does exactly what you think it does.  Anything that had a death sound is now Wilhelm, because you can't have too much Wilhelm.  This strangely includes Chorus Flower for some reason...

Supported Mobs:

    - Allay
    - Axolotl
    - Bat
    - Bee
    - Blaze
    - Cat
    - Creeper
    - Dolphin
    - Donkey
    - Drowned
    - Ender Dragon (This one is hilarious btw)
    - Endermen
    - Evoker
    - Fox
    - Frog
    - Ghast
    - Glow Squid
    - Goat
    - Hoglin
    - Horse
    - Husk
    - Illusioner
    - Iron Golem
    - Llama
    - Panda
    - Parrot
    - Phantom
    - Pig
    - Piglins
    - Pillager
    - Polar Bear
    - Ravager
    - Shulker
    - Skeleton
    - Snowman
    - Spider
    - Squid
    - Stray
    - Strider
    - Tadpole
    - Turtle
    - Vex
    - Villagers
    - Vindicator
    - Warden (also hilarious)
    - Witch
    - Wither
    - Wither Skeleton
    - Wolf
    - Zoglin
    - Zombie
    - Zombie Villager
    - Zombie Pigmen
    - Even the zombie/skeleton horses

Cows don't have a death sound...why Mojang >:| (also of all the fish, only Puffer Fish has a dedicated death sound lol)

Should work for all versions of Minecraft, tested in 1.12.2 and 1.19.3